This is already in SQuirreL 1.0. You can set the defaults
for new sessions in the Output tab in the Global Preferences
dialog and the settings for the current session are in the
Output tab in the Session Properties dialog. In SQuirreL
1.1beta the New Session preferences have been moved to the
New Session Preferences dialog. Currently in 1.1beta the
text display is broken but it will be coming back.